Table 2.
Freundlich Isotherm coefficients obtained for several water chemistries using baseline conditions in the SCM (pH = 8.5, 10 mM NaHCO3) with two different sorbents (E33 and GFH) and several initial arsenate and/or vanadate concentrations.
| Sorbent material | Initial Arsenate Concentration (μM) | Initial Vanadate Concentration (μM) | Freundlich Isotherm Values for arsenate (vanadate values shown in parentheses) |
|
|---|---|---|---|---|
| KF [ (mg/g)(L/mg)1/n ] | 1/n | |||
| 1.34 (100 ppb) | 0 | 8.6 | 0.21 | |
| 0.134 (10 ppb) | 0 | 14.4 | 0.28 | |
| E33 | 0.134 (10 ppb) | 0.134 (6.8 ppb) | 7.0 (17.6) | 0.22 (0.31) |
| 1.34 (100 ppb) | 1.34 (68 ppb) | 6.4 (10.9) | 0.21 (0.25) | |
| 0 | 1.34 (68 ppb) | -- (11.5) | -- (0.20) | |
|
| ||||
| 1.34 (100 ppb) | 0 | 12.1 | 0.24 | |
| 0.134 (10 ppb) | 0 | 18.2 | 0.37 | |
| GFH | 0.134 (10 ppb) | 0.134 (6.8 ppb) | 9.8 (29.3) | 0.33 (0.47) |
| 1.34 (100 ppb) | 1.34 (68 ppb) | 7.4 (14.6) | 0.27 (0.38) | |
| 0 | 1.34 (68 ppb) | -- (33.1) | -- (0.41) | |